An Outlook user may report the following error when they try to modify their Delegates settings.
The Delegates settings were not saved correctly. Cannot activate send-on-behalf-of list. You do not have sufficient privileges to perform this operation on this object.

This error can occur when the Delegates list contains a mailbox user who no longer exists in the organization. To fix the error remove the non-existent user from the Delegates list before you attempt to add other Delegates or change the Delegates settings.





It makes so much sence to follow Tweets about exchange/outlook…it took me a while to figure this one out, before reading this article.
Thanks guys!
Nice, thank you!!!! Resolved my issue.
Great job explaining this. Bugged me for several days and thank goodness I ran into your site. Grazie!
thanks, simple and objective!!